1 CHAPTER I INTRODUCTION 1.1 Background
Nowadays, the development of constructions projects in Indonesia is rapidly increasing. However, the development of construction projects has to be followed by the development of the quality of the building. The quality of the building is very important in constructions project. One of the important factors that affect the quality of the buildings is soil strength in the construction sites.
Some of construction project in Indonesia are built on the site that consist of clay. Clay is fine grain material that consists of very small particles. Because of its size, clay has small pore than other types of soils. In the construction projects, clay materials considered as bad base-soil material. Clay soils usually cause some problem on the constructions site. Mostly the problem of clay soils is related to bearing capacity, settlement, swelling and shrinkage.
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some additive such as lime, cement, cane pulp ash. Nowadays, a research of clay stabilization is still interesting subjects to be observed.
The development of industries in Indonesia brings welfare to its people. In the industrial process, fuel is needed to operate machines. Coal is one of the fuels that commonly used in industrial process. In some cases like in the power plant station (steam energy electric power station), coal is burned to produce electricity through burning process. Coal used as a fuel burning process produce waste residue that called fly ash.
Fly ash is one of the potential wastes as the result of manufacturing industries. Due to the demand of energy uses, the waste from coal burning process becomes increasing. As waste materials, commonly fly ash just dumped or ignored without any use. From the previous research, it is mentioned that using fly ash as additive for soil stabilization can increase the strength of soils. In order to develop fly ash in the better used, it is beneficial to use fly ash as additive for soil stabilization.
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1.2. Problem Statement
The sensitivity of the clay regarding to water content is the main problem in constructions sites. This study is done intended to know about:
1. Does soil stabilization using lime-fly ash can increase the shear strength of the clay?
2. What is the best proportion of the lime-fly ash to stabilizing the clay?
1.3. Problem Scope
The study focused on the shear strength characteristic of the clay. Direct shear apparatus will be used to investigate the shear strength of the clay.
1.4. Objective
This study was done in order to:
1. Know the effect of adding lime and fly ash to stabilize the clay.
2. Find the best proportion of fly ash-lime-soil to get the maximum result in stabilization of the clay soil.
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1.5. Research Originality
Sensitivity of clay to water content becomes interesting topics to be observed among the researchers. There are many researches about soils stabilization using fly ash. According to the observation that had been done before, it is mentioned that the stabilization of the clay with fly ash can increase the strength of soils. Fly ash is categorized as pozzolan that needs to be combined with Ca-rich materials to get better result in soil stabilizations. According to the author’s knowledge the study about the shear strength of lime-fly ash stabilized
